Derivatives and Hedging Activities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Summary of customer related derivative positions, not designated as hedging
Fair Value	$ (14,718)		$ (16,189)
Receive fixed, pay variable [Member] | Loan level swaps [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	149	[1]	143	[1]
2012	15,820		16,766
2013	58,632		65,344
2014	103,510		105,939
2015	44,619		45,267
Thereafter	292,650		268,932
Total	515,231		502,248
Fair Value	25,773		28,678
Pay fixed, receive variable [Member] | Loan level swaps [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	143	[1]	137	[1]
2012	15,820		16,766
2013	58,632		65,344
2014	103,510		105,939
2015	44,619		45,267
Thereafter	292,650		268,932
Total	515,231		502,248
Fair Value	(25,765)		(28,663)
Buys foreign exchange, sells US currency [Member] | Foreign exchange contracts [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	14	[1]	16	[1]
2012	37,692		42,516
2013	542
2014
2015
Thereafter
Total	38,234		42,516
Fair Value	(567)		1,748
Buys US currency, sells foreign exchange [Member] | Foreign exchange contracts [Member] | Notional Amount Maturing [Member]
Summary of customer related derivative positions, not designated as hedging
Number of Positions	14	[1]	16	[1]
2012	37,715		42,516
2013	543
2014
2015
Thereafter
Total	38,258		42,516
Fair Value	$ 591		$ (1,718)

[1] The Company may enter into one swap agreement which offsets multiple reverse swap agreements. The positions will offset and the terms will be identical.